4th order bandpasses have 2 resonance's, and 6th orders have 4!
When doing bandpasses you have to group the resonances to your liking or so that the response is reasonable.
It is good to measure the real world impedance position of the resonances with something like a woofer tester so that you can tell how the design is really comming out because if you use winisd it may look all good and dandy, but the real world tunning and loss of each chamber and port may change things a little, and then there is the possibility that you weren't very accurate about the net volume inside.
Also, cabin gain will change a pretty looking predicted response from something like winisd, alot of people may not realize or forget that cabin gain changes what the response really looks like.
Like was said, don't listen over the net, alot of people use calculators only and or ratios and that wont help.